my own experience tells me that building fluid layouts is less work eventually, whereas with fixed sizes, you add so many assumptions in your code that changing one element in the UI *will* break everything

CosmoHill: you could compare flash to excretion, and follow up with this one: "Triploblasts played a crucial role in evolution, precisely because they *did* have internal organs, and in particular they could ingest and excrete it. Their excreta became a major resource of for other creatures; [TBC on next line ...]"